When people pay attention to one thing and filter out all other stimuli this is called selective attention. Depending on how involved the individual is will determine how easily they can be distracted. As long as you give people specific directions to pay attention to only one thing then they will ignore everything else.
People filter information. It can often be useful since it filters out the amount of information you have to pay attention to at one given time. However it can also lead to bad choices. As a designer you should not make assumptions as things might not be as obvious to people as you think.
People can perform tasks that use well-practiced skills without the need of conscious attention. This can also cause errors cause the people will no longer pay attention to what they are doing.
People cannot actually multitask. Although people tend to think that they can often times multitask, research has shown that this is not the case. You can only think about one thing at a time. You can only conduct one mental activity at a time. People are good at switching back and forth from one task to another, but that is not multitasking.
NO CELL PHONE WHILE DRIVING UNLESS YOU HAVE A HANDS-FREE DEVICE IS A USELESS LAW!
Danger, food, sex, movement, faces, and stories get the most attention. Although it may not be appropriate at times to use food, sex, or danger in your design, you will surely get a lot of attention if you do.
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